One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,3,4)(5,6,11,16)(7,17,21,28)(8,22,25,29)(9,13,10,15)(12,18,26,20)(14,23,30,24)(19,27,33,35)(31,34,36,32)(5,7,9,20,11,21,10,18)(6,12,15,17,16,26,13,28)(8,19,24,34,25,33,23,32)(14,27,22,31,30,35,29,36)(2,4)(6,13)(7,18)(8,23)(9,10)(12,26)(14,30)(15,16)(19,33)(20,21)(24,25)(27,31)(35,36) involution — undirected(5,8)(6,14)(7,19)(9,24)(10,23)(11,25)(12,27)(13,29)(15,22)(16,30)(17,31)(18,32)(20,34)(21,33)(26,35)(28,36) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.